just take it easy on the turns and don't try to do it in such a small area. give yourself more room to maneuver and as you become more comfortable with the machine and how your inputs affect it you'll notice you need less and less room to make the turns without tearing up turf. your inputs will become more fluid and controlled. try and keep both tires moving throughout a turn. there's definitely a learning curve to it that only time and practice will make better. practice makes perfect!